Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-03-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 7 figures
Scientific paper
We derive the forward photoproduction amplitude for the diffractive $\gamma p \to l^+ l^- p$ reaction in the momentum space. within the formalism of $k_\perp$- factorization. Predictions for the $\gamma p \to l^+ l^- p$ reaction are given using unintegrated gluon distribution from the literature. We calculate the total cross section as a function of photon-proton center of mass energy and the invariant mass distribution of the lepton pair. We also discuss whether the production of timelike virtual photons can be approximated by continuing to the spacelike domain $ q^2 < 0$. The present calculation provides an input for future predictions for exclusive hadroproduction in the $p p \to p l^+ l^- p$ reaction.
Schäfer Wolfgang
Slipek Gabriela
Szczurek Antoni
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